package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.BaseException;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import lombok.extern.slf4j.Slf4j;
import org.apache.http.impl.client.HttpClients;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.HashMap;

@Service
@Slf4j
public class UserServiceImpl implements UserService {
    @Autowired
    WeChatProperties weChatProperties;
    @Autowired
    UserMapper userMapper;
    //定义微信登录的api
    public static String WX_LOGIN = "https://api.weixin.qq.com/sns/jscode2session";
    /**
     * 微信登录
     * @param userLoginDTO
     * @return
     */
    @Override
    public User wxLogin(UserLoginDTO userLoginDTO) {
        String openid = getOpenId(userLoginDTO.getCode());
        //判断openid是否为空，返回为空登录失败
        if (openid==null){
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }
        //判断是否为新用户
        //如果是新用户，自动完成注册
        User user = userMapper.getByOpenId(openid);
        if (user==null){
            user = User.builder()
                        .openid(openid)
                        .createTime(LocalDateTime.now())
                        .build();
            userMapper.insert(user);
        }
        //返回这个对象
        return user;
    }

    /**
     * 抽取 调用微信接口获取openid 的方法
     * @param Code
     * @return
     */
    private String getOpenId(String Code){
        //调用微信接口服务，获取当前用户openid
        HashMap<String,String> map = new HashMap();
        map.put("appid",weChatProperties.getAppid());
        map.put("secret",weChatProperties.getSecret());
        map.put("js_code",Code);
        map.put("grant_type","authorization_code");
        String json = HttpClientUtil.doGet(WX_LOGIN, map);
        //解析json文件
        JSONObject jsonObject = JSON.parseObject(json);
        String openid = jsonObject.getString("openid");
        return openid;
    }
}
